Open AccessGradient 2D/3D Perovskite Films Prepared by Hot‐Casting for Sensitive Photodetectors
Author(s) -
Loi HokLeung,
Cao Jiupeng,
Guo Xuyun,
Liu ChunKi,
Wang Naixiang,
Song Jiajun,
Tang Guanqi,
Zhu Ye,
Yan Feng
Publication year - 2020
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202000776
Subject(s) - photodetector , responsivity , perovskite (structure) , materials science , heterojunction , optoelectronics , thin film , casting , nanotechnology , composite material , chemistry , crystallography
2D Ruddlesden–Popper perovskites have attracted wide attention recently because of tunable optoelectronic properties and have been used as alternatives to their 3D counterparts in various optoelectronic devices. Here, a series of (PEA) 2 (MA) n −1 Pb n I 3 n +1 perovskite thin films is designed and fabricated by a convenient hot‐casting method to obtain gradient n in the films, which leads to the formation of vertical heterojunctions that can enhance charge separation in the films under light illumination. Based on a single gradient perovskite film, a highly sensitive and stable photodetector with a responsivity up to 149 AW −1 and a specific detectivity of 2 × 10 12 Jones is obtained. This work paves a way to realizing high‐performance optoelectronic devices with enhanced charge separation by introducing compositional gradient in a perovskite film.